#include <iostream>
#include <string>
#include <new>

using namespace std;
const int BUF = 512;

class JustTesting{
    private:
    string words;
    int number;
    public:
    JustTesting(const string & s = "Just Testing", int n = 0){
        words = s; number = n; cout<<words << " constructed.\n";
    }
    ~JustTesting(){cout << words << " destroyed\n";}
    void show() const {cout << words << ", " << number << endl;}
};

int main50() {
    char * buffer = new char[BUF];
    JustTesting *pc1, *pc2;

    pc1 = new (buffer)JustTesting;
    pc2 = new JustTesting("Heap1", 20);

    cout << "Memory block addresses\n" << " buffer: " 
        << (void *) buffer << " heap:" << pc2 << "\n";

    cout << "Memory contents:\n";
    cout << pc1 << ": ";
    pc1->show();

    cout << pc2 << ": ";
    pc2->show();

    JustTesting *pc3, *pc4;
    pc3 = new (buffer + sizeof(JustTesting))JustTesting("Better idea", 6);
    pc4 = new JustTesting("Heap2", 10);

    cout << "Memory contents:\n";
    cout << pc3 << ": " ;
    pc3->show();
    cout <<pc4 <<": ";
    pc4->show();

    delete pc2;
    delete pc4;
    pc3->~JustTesting();
    pc1->~JustTesting();
    delete [] buffer;
    cout << "Done \n";
    return 0;
}